1package eu.siacs.conversations.crypto.axolotl;
2
3import android.support.annotation.Nullable;
4import android.util.Base64;
5import android.util.Log;
6
7import org.whispersystems.libaxolotl.AxolotlAddress;
8import org.whispersystems.libaxolotl.DuplicateMessageException;
9import org.whispersystems.libaxolotl.IdentityKey;
10import org.whispersystems.libaxolotl.IdentityKeyPair;
11import org.whispersystems.libaxolotl.InvalidKeyException;
12import org.whispersystems.libaxolotl.InvalidKeyIdException;
13import org.whispersystems.libaxolotl.InvalidMessageException;
14import org.whispersystems.libaxolotl.InvalidVersionException;
15import org.whispersystems.libaxolotl.LegacyMessageException;
16import org.whispersystems.libaxolotl.NoSessionException;
17import org.whispersystems.libaxolotl.SessionBuilder;
18import org.whispersystems.libaxolotl.SessionCipher;
19import org.whispersystems.libaxolotl.UntrustedIdentityException;
20import org.whispersystems.libaxolotl.ecc.Curve;
21import org.whispersystems.libaxolotl.ecc.ECKeyPair;
22import org.whispersystems.libaxolotl.ecc.ECPublicKey;
23import org.whispersystems.libaxolotl.protocol.CiphertextMessage;
24import org.whispersystems.libaxolotl.protocol.PreKeyWhisperMessage;
25import org.whispersystems.libaxolotl.protocol.WhisperMessage;
26import org.whispersystems.libaxolotl.state.AxolotlStore;
27import org.whispersystems.libaxolotl.state.PreKeyBundle;
28import org.whispersystems.libaxolotl.state.PreKeyRecord;
29import org.whispersystems.libaxolotl.state.SessionRecord;
30import org.whispersystems.libaxolotl.state.SignedPreKeyRecord;
31import org.whispersystems.libaxolotl.util.KeyHelper;
32
33import java.util.ArrayList;
34import java.util.Arrays;
35import java.util.HashMap;
36import java.util.HashSet;
37import java.util.List;
38import java.util.Map;
39import java.util.Random;
40import java.util.Set;
41
42import eu.siacs.conversations.Config;
43import eu.siacs.conversations.entities.Account;
44import eu.siacs.conversations.entities.Contact;
45import eu.siacs.conversations.entities.Conversation;
46import eu.siacs.conversations.entities.Message;
47import eu.siacs.conversations.parser.IqParser;
48import eu.siacs.conversations.services.XmppConnectionService;
49import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
50import eu.siacs.conversations.xml.Element;
51import eu.siacs.conversations.xmpp.OnIqPacketReceived;
52import eu.siacs.conversations.xmpp.jid.InvalidJidException;
53import eu.siacs.conversations.xmpp.jid.Jid;
54import eu.siacs.conversations.xmpp.stanzas.IqPacket;
55import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
56
57public class AxolotlService {
58
59 public static final String PEP_PREFIX = "eu.siacs.conversations.axolotl";
60 public static final String PEP_DEVICE_LIST = PEP_PREFIX + ".devicelist";
61 public static final String PEP_BUNDLES = PEP_PREFIX + ".bundles";
62
63 public static final int NUM_KEYS_TO_PUBLISH = 10;
64
65 private final Account account;
66 private final XmppConnectionService mXmppConnectionService;
67 private final SQLiteAxolotlStore axolotlStore;
68 private final SessionMap sessions;
69 private final Map<Jid, Set<Integer>> deviceIds;
70 private final Map<String, MessagePacket> messageCache;
71 private final FetchStatusMap fetchStatusMap;
72 private final SerialSingleThreadExecutor executor;
73 private int ownDeviceId;
74
75 public static class SQLiteAxolotlStore implements AxolotlStore {
76
77 public static final String PREKEY_TABLENAME = "prekeys";
78 public static final String SIGNED_PREKEY_TABLENAME = "signed_prekeys";
79 public static final String SESSION_TABLENAME = "sessions";
80 public static final String IDENTITIES_TABLENAME = "identities";
81 public static final String ACCOUNT = "account";
82 public static final String DEVICE_ID = "device_id";
83 public static final String ID = "id";
84 public static final String KEY = "key";
85 public static final String NAME = "name";
86 public static final String TRUSTED = "trusted";
87 public static final String OWN = "ownkey";
88
89 public static final String JSONKEY_IDENTITY_KEY_PAIR = "axolotl_key";
90 public static final String JSONKEY_REGISTRATION_ID = "axolotl_reg_id";
91 public static final String JSONKEY_CURRENT_PREKEY_ID = "axolotl_cur_prekey_id";
92
93 private final Account account;
94 private final XmppConnectionService mXmppConnectionService;
95
96 private IdentityKeyPair identityKeyPair;
97 private final int localRegistrationId;
98 private int currentPreKeyId = 0;
99
100
101 private static IdentityKeyPair generateIdentityKeyPair() {
102 Log.d(Config.LOGTAG, "Generating axolotl IdentityKeyPair...");
103 ECKeyPair identityKeyPairKeys = Curve.generateKeyPair();
104 IdentityKeyPair ownKey = new IdentityKeyPair(new IdentityKey(identityKeyPairKeys.getPublicKey()),
105 identityKeyPairKeys.getPrivateKey());
106 return ownKey;
107 }
108
109 private static int generateRegistrationId() {
110 Log.d(Config.LOGTAG, "Generating axolotl registration ID...");
111 int reg_id = KeyHelper.generateRegistrationId(false);
112 return reg_id;
113 }
114
115 public SQLiteAxolotlStore(Account account, XmppConnectionService service) {
116 this.account = account;
117 this.mXmppConnectionService = service;
118 this.localRegistrationId = loadRegistrationId();
119 this.currentPreKeyId = loadCurrentPreKeyId();
120 for (SignedPreKeyRecord record : loadSignedPreKeys()) {
121 Log.d(Config.LOGTAG, "Got Axolotl signed prekey record:" + record.getId());
122 }
123 }
124
125 public int getCurrentPreKeyId() {
126 return currentPreKeyId;
127 }
128
129 // --------------------------------------
130 // IdentityKeyStore
131 // --------------------------------------
132
133 private IdentityKeyPair loadIdentityKeyPair() {
134 String ownName = account.getJid().toBareJid().toString();
135 IdentityKeyPair ownKey = mXmppConnectionService.databaseBackend.loadOwnIdentityKeyPair(account,
136 ownName);
137
138 if (ownKey != null) {
139 return ownKey;
140 } else {
141 Log.d(Config.LOGTAG, "Could not retrieve axolotl key for account " + ownName);
142 ownKey = generateIdentityKeyPair();
143 mXmppConnectionService.databaseBackend.storeOwnIdentityKeyPair(account, ownName, ownKey);
144 }
145 return ownKey;
146 }
147
148 private int loadRegistrationId() {
149 String regIdString = this.account.getKey(JSONKEY_REGISTRATION_ID);
150 int reg_id;
151 if (regIdString != null) {
152 reg_id = Integer.valueOf(regIdString);
153 } else {
154 Log.d(Config.LOGTAG, "Could not retrieve axolotl registration id for account " + account.getJid());
155 reg_id = generateRegistrationId();
156 boolean success = this.account.setKey(JSONKEY_REGISTRATION_ID, Integer.toString(reg_id));
157 if (success) {
158 mXmppConnectionService.databaseBackend.updateAccount(account);
159 } else {
160 Log.e(Config.LOGTAG, "Failed to write new key to the database!");
161 }
162 }
163 return reg_id;
164 }
165
166 private int loadCurrentPreKeyId() {
167 String regIdString = this.account.getKey(JSONKEY_CURRENT_PREKEY_ID);
168 int reg_id;
169 if (regIdString != null) {
170 reg_id = Integer.valueOf(regIdString);
171 } else {
172 Log.d(Config.LOGTAG, "Could not retrieve current prekey id for account " + account.getJid());
173 reg_id = 0;
174 }
175 return reg_id;
176 }
177
178
179 /**
180 * Get the local client's identity key pair.
181 *
182 * @return The local client's persistent identity key pair.
183 */
184 @Override
185 public IdentityKeyPair getIdentityKeyPair() {
186 if(identityKeyPair == null) {
187 identityKeyPair = loadIdentityKeyPair();
188 }
189 return identityKeyPair;
190 }
191
192 /**
193 * Return the local client's registration ID.
194 * <p/>
195 * Clients should maintain a registration ID, a random number
196 * between 1 and 16380 that's generated once at install time.
197 *
198 * @return the local client's registration ID.
199 */
200 @Override
201 public int getLocalRegistrationId() {
202 return localRegistrationId;
203 }
204
205 /**
206 * Save a remote client's identity key
207 * <p/>
208 * Store a remote client's identity key as trusted.
209 *
210 * @param name The name of the remote client.
211 * @param identityKey The remote client's identity key.
212 */
213 @Override
214 public void saveIdentity(String name, IdentityKey identityKey) {
215 if(!mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name).contains(identityKey)) {
216 mXmppConnectionService.databaseBackend.storeIdentityKey(account, name, identityKey);
217 }
218 }
219
220 /**
221 * Verify a remote client's identity key.
222 * <p/>
223 * Determine whether a remote client's identity is trusted. Convention is
224 * that the TextSecure protocol is 'trust on first use.' This means that
225 * an identity key is considered 'trusted' if there is no entry for the recipient
226 * in the local store, or if it matches the saved key for a recipient in the local
227 * store. Only if it mismatches an entry in the local store is it considered
228 * 'untrusted.'
229 *
230 * @param name The name of the remote client.
231 * @param identityKey The identity key to verify.
232 * @return true if trusted, false if untrusted.
233 */
234 @Override
235 public boolean isTrustedIdentity(String name, IdentityKey identityKey) {
236 Set<IdentityKey> trustedKeys = mXmppConnectionService.databaseBackend.loadIdentityKeys(account, name);
237 return trustedKeys.isEmpty() || trustedKeys.contains(identityKey);
238 }
239
240 // --------------------------------------
241 // SessionStore
242 // --------------------------------------
243
244 /**
245 * Returns a copy of the {@link SessionRecord} corresponding to the recipientId + deviceId tuple,
246 * or a new SessionRecord if one does not currently exist.
247 * <p/>
248 * It is important that implementations return a copy of the current durable information. The
249 * returned SessionRecord may be modified, but those changes should not have an effect on the
250 * durable session state (what is returned by subsequent calls to this method) without the
251 * store method being called here first.
252 *
253 * @param address The name and device ID of the remote client.
254 * @return a copy of the SessionRecord corresponding to the recipientId + deviceId tuple, or
255 * a new SessionRecord if one does not currently exist.
256 */
257 @Override
258 public SessionRecord loadSession(AxolotlAddress address) {
259 SessionRecord session = mXmppConnectionService.databaseBackend.loadSession(this.account, address);
260 return (session != null) ? session : new SessionRecord();
261 }
262
263 /**
264 * Returns all known devices with active sessions for a recipient
265 *
266 * @param name the name of the client.
267 * @return all known sub-devices with active sessions.
268 */
269 @Override
270 public List<Integer> getSubDeviceSessions(String name) {
271 return mXmppConnectionService.databaseBackend.getSubDeviceSessions(account,
272 new AxolotlAddress(name, 0));
273 }
274
275 /**
276 * Commit to storage the {@link SessionRecord} for a given recipientId + deviceId tuple.
277 *
278 * @param address the address of the remote client.
279 * @param record the current SessionRecord for the remote client.
280 */
281 @Override
282 public void storeSession(AxolotlAddress address, SessionRecord record) {
283 mXmppConnectionService.databaseBackend.storeSession(account, address, record);
284 }
285
286 /**
287 * Determine whether there is a committed {@link SessionRecord} for a recipientId + deviceId tuple.
288 *
289 * @param address the address of the remote client.
290 * @return true if a {@link SessionRecord} exists, false otherwise.
291 */
292 @Override
293 public boolean containsSession(AxolotlAddress address) {
294 return mXmppConnectionService.databaseBackend.containsSession(account, address);
295 }
296
297 /**
298 * Remove a {@link SessionRecord} for a recipientId + deviceId tuple.
299 *
300 * @param address the address of the remote client.
301 */
302 @Override
303 public void deleteSession(AxolotlAddress address) {
304 mXmppConnectionService.databaseBackend.deleteSession(account, address);
305 }
306
307 /**
308 * Remove the {@link SessionRecord}s corresponding to all devices of a recipientId.
309 *
310 * @param name the name of the remote client.
311 */
312 @Override
313 public void deleteAllSessions(String name) {
314 mXmppConnectionService.databaseBackend.deleteAllSessions(account,
315 new AxolotlAddress(name, 0));
316 }
317
318 public boolean isTrustedSession(AxolotlAddress address) {
319 return mXmppConnectionService.databaseBackend.isTrustedSession(this.account, address);
320 }
321
322 public void setTrustedSession(AxolotlAddress address, boolean trusted) {
323 mXmppConnectionService.databaseBackend.setTrustedSession(this.account, address, trusted);
324 }
325
326 // --------------------------------------
327 // PreKeyStore
328 // --------------------------------------
329
330 /**
331 * Load a local PreKeyRecord.
332 *
333 * @param preKeyId the ID of the local PreKeyRecord.
334 * @return the corresponding PreKeyRecord.
335 * @throws InvalidKeyIdException when there is no corresponding PreKeyRecord.
336 */
337 @Override
338 public PreKeyRecord loadPreKey(int preKeyId) throws InvalidKeyIdException {
339 PreKeyRecord record = mXmppConnectionService.databaseBackend.loadPreKey(account, preKeyId);
340 if (record == null) {
341 throw new InvalidKeyIdException("No such PreKeyRecord: " + preKeyId);
342 }
343 return record;
344 }
345
346 /**
347 * Store a local PreKeyRecord.
348 *
349 * @param preKeyId the ID of the PreKeyRecord to store.
350 * @param record the PreKeyRecord.
351 */
352 @Override
353 public void storePreKey(int preKeyId, PreKeyRecord record) {
354 mXmppConnectionService.databaseBackend.storePreKey(account, record);
355 currentPreKeyId = preKeyId;
356 boolean success = this.account.setKey(JSONKEY_CURRENT_PREKEY_ID, Integer.toString(preKeyId));
357 if (success) {
358 mXmppConnectionService.databaseBackend.updateAccount(account);
359 } else {
360 Log.e(Config.LOGTAG, "Failed to write new prekey id to the database!");
361 }
362 }
363
364 /**
365 * @param preKeyId A PreKeyRecord ID.
366 * @return true if the store has a record for the preKeyId, otherwise false.
367 */
368 @Override
369 public boolean containsPreKey(int preKeyId) {
370 return mXmppConnectionService.databaseBackend.containsPreKey(account, preKeyId);
371 }
372
373 /**
374 * Delete a PreKeyRecord from local storage.
375 *
376 * @param preKeyId The ID of the PreKeyRecord to remove.
377 */
378 @Override
379 public void removePreKey(int preKeyId) {
380 mXmppConnectionService.databaseBackend.deletePreKey(account, preKeyId);
381 }
382
383 // --------------------------------------
384 // SignedPreKeyStore
385 // --------------------------------------
386
387 /**
388 * Load a local SignedPreKeyRecord.
389 *
390 * @param signedPreKeyId the ID of the local SignedPreKeyRecord.
391 * @return the corresponding SignedPreKeyRecord.
392 * @throws InvalidKeyIdException when there is no corresponding SignedPreKeyRecord.
393 */
394 @Override
395 public SignedPreKeyRecord loadSignedPreKey(int signedPreKeyId) throws InvalidKeyIdException {
396 SignedPreKeyRecord record = mXmppConnectionService.databaseBackend.loadSignedPreKey(account, signedPreKeyId);
397 if (record == null) {
398 throw new InvalidKeyIdException("No such SignedPreKeyRecord: " + signedPreKeyId);
399 }
400 return record;
401 }
402
403 /**
404 * Load all local SignedPreKeyRecords.
405 *
406 * @return All stored SignedPreKeyRecords.
407 */
408 @Override
409 public List<SignedPreKeyRecord> loadSignedPreKeys() {
410 return mXmppConnectionService.databaseBackend.loadSignedPreKeys(account);
411 }
412
413 /**
414 * Store a local SignedPreKeyRecord.
415 *
416 * @param signedPreKeyId the ID of the SignedPreKeyRecord to store.
417 * @param record the SignedPreKeyRecord.
418 */
419 @Override
420 public void storeSignedPreKey(int signedPreKeyId, SignedPreKeyRecord record) {
421 mXmppConnectionService.databaseBackend.storeSignedPreKey(account, record);
422 }
423
424 /**
425 * @param signedPreKeyId A SignedPreKeyRecord ID.
426 * @return true if the store has a record for the signedPreKeyId, otherwise false.
427 */
428 @Override
429 public boolean containsSignedPreKey(int signedPreKeyId) {
430 return mXmppConnectionService.databaseBackend.containsSignedPreKey(account, signedPreKeyId);
431 }
432
433 /**
434 * Delete a SignedPreKeyRecord from local storage.
435 *
436 * @param signedPreKeyId The ID of the SignedPreKeyRecord to remove.
437 */
438 @Override
439 public void removeSignedPreKey(int signedPreKeyId) {
440 mXmppConnectionService.databaseBackend.deleteSignedPreKey(account, signedPreKeyId);
441 }
442 }
443
444 public static class XmppAxolotlSession {
445 private SessionCipher cipher;
446 private boolean isTrusted = false;
447 private Integer preKeyId = null;
448 private SQLiteAxolotlStore sqLiteAxolotlStore;
449 private AxolotlAddress remoteAddress;
450
451 public XmppAxolotlSession(SQLiteAxolotlStore store, AxolotlAddress remoteAddress) {
452 this.cipher = new SessionCipher(store, remoteAddress);
453 this.remoteAddress = remoteAddress;
454 this.sqLiteAxolotlStore = store;
455 this.isTrusted = sqLiteAxolotlStore.isTrustedSession(remoteAddress);
456 }
457
458 public void trust() {
459 sqLiteAxolotlStore.setTrustedSession(remoteAddress, true);
460 this.isTrusted = true;
461 }
462
463 public boolean isTrusted() {
464 return this.isTrusted;
465 }
466
467 public Integer getPreKeyId() {
468 return preKeyId;
469 }
470
471 public void resetPreKeyId() {
472 preKeyId = null;
473 }
474
475 public byte[] processReceiving(XmppAxolotlMessage.XmppAxolotlMessageHeader incomingHeader) {
476 byte[] plaintext = null;
477 try {
478 try {
479 PreKeyWhisperMessage message = new PreKeyWhisperMessage(incomingHeader.getContents());
480 Log.d(Config.LOGTAG, "PreKeyWhisperMessage ID:" + message.getSignedPreKeyId() + "/" + message.getPreKeyId());
481 plaintext = cipher.decrypt(message);
482 if (message.getPreKeyId().isPresent()) {
483 preKeyId = message.getPreKeyId().get();
484 }
485 } catch (InvalidMessageException | InvalidVersionException e) {
486 WhisperMessage message = new WhisperMessage(incomingHeader.getContents());
487 plaintext = cipher.decrypt(message);
488 } catch (InvalidKeyException | InvalidKeyIdException | UntrustedIdentityException e) {
489 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
490 }
491 } catch (LegacyMessageException | InvalidMessageException e) {
492 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
493 } catch (DuplicateMessageException | NoSessionException e) {
494 Log.d(Config.LOGTAG, "Error decrypting axolotl header, "+e.getClass().getName()+": " + e.getMessage());
495 }
496 return plaintext;
497 }
498
499 public XmppAxolotlMessage.XmppAxolotlMessageHeader processSending(byte[] outgoingMessage) {
500 CiphertextMessage ciphertextMessage = cipher.encrypt(outgoingMessage);
501 XmppAxolotlMessage.XmppAxolotlMessageHeader header =
502 new XmppAxolotlMessage.XmppAxolotlMessageHeader(remoteAddress.getDeviceId(),
503 ciphertextMessage.serialize());
504 return header;
505 }
506 }
507
508 private static class AxolotlAddressMap<T> {
509 protected Map<String, Map<Integer, T>> map;
510 protected final Object MAP_LOCK = new Object();
511
512 public AxolotlAddressMap() {
513 this.map = new HashMap<>();
514 }
515
516 public void put(AxolotlAddress address, T value) {
517 synchronized (MAP_LOCK) {
518 Map<Integer, T> devices = map.get(address.getName());
519 if (devices == null) {
520 devices = new HashMap<>();
521 map.put(address.getName(), devices);
522 }
523 devices.put(address.getDeviceId(), value);
524 }
525 }
526
527 public T get(AxolotlAddress address) {
528 synchronized (MAP_LOCK) {
529 Map<Integer, T> devices = map.get(address.getName());
530 if (devices == null) {
531 return null;
532 }
533 return devices.get(address.getDeviceId());
534 }
535 }
536
537 public Map<Integer, T> getAll(AxolotlAddress address) {
538 synchronized (MAP_LOCK) {
539 Map<Integer, T> devices = map.get(address.getName());
540 if (devices == null) {
541 return new HashMap<>();
542 }
543 return devices;
544 }
545 }
546
547 public boolean hasAny(AxolotlAddress address) {
548 synchronized (MAP_LOCK) {
549 Map<Integer, T> devices = map.get(address.getName());
550 return devices != null && !devices.isEmpty();
551 }
552 }
553
554
555 }
556
557 private static class SessionMap extends AxolotlAddressMap<XmppAxolotlSession> {
558
559 public SessionMap(SQLiteAxolotlStore store, Account account) {
560 super();
561 this.fillMap(store, account);
562 }
563
564 private void fillMap(SQLiteAxolotlStore store, Account account) {
565 for (Contact contact : account.getRoster().getContacts()) {
566 Jid bareJid = contact.getJid().toBareJid();
567 if (bareJid == null) {
568 continue; // FIXME: handle this?
569 }
570 String address = bareJid.toString();
571 List<Integer> deviceIDs = store.getSubDeviceSessions(address);
572 for (Integer deviceId : deviceIDs) {
573 AxolotlAddress axolotlAddress = new AxolotlAddress(address, deviceId);
574 this.put(axolotlAddress, new XmppAxolotlSession(store, axolotlAddress));
575 }
576 }
577 }
578
579 }
580
581 private static enum FetchStatus {
582 PENDING,
583 SUCCESS,
584 ERROR
585 }
586
587 private static class FetchStatusMap extends AxolotlAddressMap<FetchStatus> {
588
589 }
590
591 public AxolotlService(Account account, XmppConnectionService connectionService) {
592 this.mXmppConnectionService = connectionService;
593 this.account = account;
594 this.axolotlStore = new SQLiteAxolotlStore(this.account, this.mXmppConnectionService);
595 this.deviceIds = new HashMap<>();
596 this.messageCache = new HashMap<>();
597 this.sessions = new SessionMap(axolotlStore, account);
598 this.fetchStatusMap = new FetchStatusMap();
599 this.executor = new SerialSingleThreadExecutor();
600 this.ownDeviceId = axolotlStore.getLocalRegistrationId();
601 }
602
603 public void trustSession(AxolotlAddress counterpart) {
604 XmppAxolotlSession session = sessions.get(counterpart);
605 if (session != null) {
606 session.trust();
607 }
608 }
609
610 public boolean isTrustedSession(AxolotlAddress counterpart) {
611 XmppAxolotlSession session = sessions.get(counterpart);
612 return session != null && session.isTrusted();
613 }
614
615 private AxolotlAddress getAddressForJid(Jid jid) {
616 return new AxolotlAddress(jid.toString(), 0);
617 }
618
619 private Set<XmppAxolotlSession> findOwnSessions() {
620 AxolotlAddress ownAddress = getAddressForJid(account.getJid().toBareJid());
621 Set<XmppAxolotlSession> ownDeviceSessions = new HashSet<>(this.sessions.getAll(ownAddress).values());
622 return ownDeviceSessions;
623 }
624
625 private Set<XmppAxolotlSession> findSessionsforContact(Contact contact) {
626 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
627 Set<XmppAxolotlSession> sessions = new HashSet<>(this.sessions.getAll(contactAddress).values());
628 return sessions;
629 }
630
631 private boolean hasAny(Contact contact) {
632 AxolotlAddress contactAddress = getAddressForJid(contact.getJid());
633 return sessions.hasAny(contactAddress);
634 }
635
636 public int getOwnDeviceId() {
637 return ownDeviceId;
638 }
639
640 public void registerDevices(final Jid jid, final Set<Integer> deviceIds) {
641 for(Integer i:deviceIds) {
642 Log.d(Config.LOGTAG, "Adding Device ID:"+ jid + ":"+i);
643 }
644 this.deviceIds.put(jid, deviceIds);
645 }
646
647 public void publishOwnDeviceIdIfNeeded() {
648 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveDeviceIds(account.getJid().toBareJid());
649 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
650 @Override
651 public void onIqPacketReceived(Account account, IqPacket packet) {
652 Element item = mXmppConnectionService.getIqParser().getItem(packet);
653 Set<Integer> deviceIds = mXmppConnectionService.getIqParser().deviceIds(item);
654 if (deviceIds == null) {
655 deviceIds = new HashSet<Integer>();
656 }
657 if (!deviceIds.contains(getOwnDeviceId())) {
658 deviceIds.add(getOwnDeviceId());
659 IqPacket publish = mXmppConnectionService.getIqGenerator().publishDeviceIds(deviceIds);
660 Log.d(Config.LOGTAG, "Own device " + getOwnDeviceId() + " not in PEP devicelist. Publishing: " + publish);
661 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
662 @Override
663 public void onIqPacketReceived(Account account, IqPacket packet) {
664 // TODO: implement this!
665 }
666 });
667 }
668 }
669 });
670 }
671
672 public void publishBundlesIfNeeded() {
673 IqPacket packet = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(account.getJid().toBareJid(), ownDeviceId);
674 mXmppConnectionService.sendIqPacket(account, packet, new OnIqPacketReceived() {
675 @Override
676 public void onIqPacketReceived(Account account, IqPacket packet) {
677 PreKeyBundle bundle = mXmppConnectionService.getIqParser().bundle(packet);
678 Map<Integer, ECPublicKey> keys = mXmppConnectionService.getIqParser().preKeyPublics(packet);
679 boolean flush = false;
680 if (bundle == null) {
681 Log.e(Config.LOGTAG, "Received invalid bundle:" + packet);
682 bundle = new PreKeyBundle(-1, -1, -1 , null, -1, null, null, null);
683 flush = true;
684 }
685 if (keys == null) {
686 Log.e(Config.LOGTAG, "Received invalid prekeys:" + packet);
687 }
688 try {
689 boolean changed = false;
690 // Validate IdentityKey
691 IdentityKeyPair identityKeyPair = axolotlStore.getIdentityKeyPair();
692 if (flush || !identityKeyPair.getPublicKey().equals(bundle.getIdentityKey())) {
693 Log.d(Config.LOGTAG, "Adding own IdentityKey " + identityKeyPair.getPublicKey() + " to PEP.");
694 changed = true;
695 }
696
697 // Validate signedPreKeyRecord + ID
698 SignedPreKeyRecord signedPreKeyRecord;
699 int numSignedPreKeys = axolotlStore.loadSignedPreKeys().size();
700 try {
701 signedPreKeyRecord = axolotlStore.loadSignedPreKey(bundle.getSignedPreKeyId());
702 if ( flush
703 ||!bundle.getSignedPreKey().equals(signedPreKeyRecord.getKeyPair().getPublicKey())
704 || !Arrays.equals(bundle.getSignedPreKeySignature(), signedPreKeyRecord.getSignature())) {
705 Log.d(Config.LOGTAG, "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
706 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
707 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
708 changed = true;
709 }
710 } catch (InvalidKeyIdException e) {
711 Log.d(Config.LOGTAG, "Adding new signedPreKey with ID " + (numSignedPreKeys + 1) + " to PEP.");
712 signedPreKeyRecord = KeyHelper.generateSignedPreKey(identityKeyPair, numSignedPreKeys + 1);
713 axolotlStore.storeSignedPreKey(signedPreKeyRecord.getId(), signedPreKeyRecord);
714 changed = true;
715 }
716
717 // Validate PreKeys
718 Set<PreKeyRecord> preKeyRecords = new HashSet<>();
719 if (keys != null) {
720 for (Integer id : keys.keySet()) {
721 try {
722 PreKeyRecord preKeyRecord = axolotlStore.loadPreKey(id);
723 if (preKeyRecord.getKeyPair().getPublicKey().equals(keys.get(id))) {
724 preKeyRecords.add(preKeyRecord);
725 }
726 } catch (InvalidKeyIdException ignored) {
727 }
728 }
729 }
730 int newKeys = NUM_KEYS_TO_PUBLISH - preKeyRecords.size();
731 if (newKeys > 0) {
732 List<PreKeyRecord> newRecords = KeyHelper.generatePreKeys(
733 axolotlStore.getCurrentPreKeyId()+1, newKeys);
734 preKeyRecords.addAll(newRecords);
735 for (PreKeyRecord record : newRecords) {
736 axolotlStore.storePreKey(record.getId(), record);
737 }
738 changed = true;
739 Log.d(Config.LOGTAG, "Adding " + newKeys + " new preKeys to PEP.");
740 }
741
742
743 if(changed) {
744 IqPacket publish = mXmppConnectionService.getIqGenerator().publishBundles(
745 signedPreKeyRecord, axolotlStore.getIdentityKeyPair().getPublicKey(),
746 preKeyRecords, ownDeviceId);
747 Log.d(Config.LOGTAG, "Bundle " + getOwnDeviceId() + " in PEP not current. Publishing: " + publish);
748 mXmppConnectionService.sendIqPacket(account, publish, new OnIqPacketReceived() {
749 @Override
750 public void onIqPacketReceived(Account account, IqPacket packet) {
751 // TODO: implement this!
752 Log.d(Config.LOGTAG, "Published bundle, got: " + packet);
753 }
754 });
755 }
756 } catch (InvalidKeyException e) {
757 Log.e(Config.LOGTAG, "Failed to publish bundle " + getOwnDeviceId() + ", reason: " + e.getMessage());
758 return;
759 }
760 }
761 });
762 }
763
764 public boolean isContactAxolotlCapable(Contact contact) {
765 Jid jid = contact.getJid().toBareJid();
766 AxolotlAddress address = new AxolotlAddress(jid.toString(), 0);
767 return sessions.hasAny(address) ||
768 ( deviceIds.containsKey(jid) && !deviceIds.get(jid).isEmpty());
769 }
770
771 private void buildSessionFromPEP(final Conversation conversation, final AxolotlAddress address) {
772 Log.d(Config.LOGTAG, "Building new sesstion for " + address.getDeviceId());
773
774 try {
775 IqPacket bundlesPacket = mXmppConnectionService.getIqGenerator().retrieveBundlesForDevice(
776 Jid.fromString(address.getName()), address.getDeviceId());
777 Log.d(Config.LOGTAG, "Retrieving bundle: " + bundlesPacket);
778 mXmppConnectionService.sendIqPacket(account, bundlesPacket, new OnIqPacketReceived() {
779 @Override
780 public void onIqPacketReceived(Account account, IqPacket packet) {
781 Log.d(Config.LOGTAG, "Received preKey IQ packet, processing...");
782 final IqParser parser = mXmppConnectionService.getIqParser();
783 final List<PreKeyBundle> preKeyBundleList = parser.preKeys(packet);
784 final PreKeyBundle bundle = parser.bundle(packet);
785 if (preKeyBundleList.isEmpty() || bundle == null) {
786 Log.d(Config.LOGTAG, "preKey IQ packet invalid: " + packet);
787 fetchStatusMap.put(address, FetchStatus.ERROR);
788 return;
789 }
790 Random random = new Random();
791 final PreKeyBundle preKey = preKeyBundleList.get(random.nextInt(preKeyBundleList.size()));
792 if (preKey == null) {
793 //should never happen
794 fetchStatusMap.put(address, FetchStatus.ERROR);
795 return;
796 }
797
798 final PreKeyBundle preKeyBundle = new PreKeyBundle(0, address.getDeviceId(),
799 preKey.getPreKeyId(), preKey.getPreKey(),
800 bundle.getSignedPreKeyId(), bundle.getSignedPreKey(),
801 bundle.getSignedPreKeySignature(), bundle.getIdentityKey());
802
803 axolotlStore.saveIdentity(address.getName(), bundle.getIdentityKey());
804
805 try {
806 SessionBuilder builder = new SessionBuilder(axolotlStore, address);
807 builder.process(preKeyBundle);
808 XmppAxolotlSession session = new XmppAxolotlSession(axolotlStore, address);
809 sessions.put(address, session);
810 fetchStatusMap.put(address, FetchStatus.SUCCESS);
811 } catch (UntrustedIdentityException|InvalidKeyException e) {
812 Log.d(Config.LOGTAG, "Error building session for " + address + ": "
813 + e.getClass().getName() + ", " + e.getMessage());
814 fetchStatusMap.put(address, FetchStatus.ERROR);
815 }
816
817 AxolotlAddress ownAddress = new AxolotlAddress(conversation.getAccount().getJid().toBareJid().toString(),0);
818 AxolotlAddress foreignAddress = new AxolotlAddress(conversation.getJid().toBareJid().toString(),0);
819 if (!fetchStatusMap.getAll(ownAddress).containsValue(FetchStatus.PENDING)
820 && !fetchStatusMap.getAll(foreignAddress).containsValue(FetchStatus.PENDING)) {
821 conversation.findUnsentMessagesWithEncryption(Message.ENCRYPTION_AXOLOTL,
822 new Conversation.OnMessageFound() {
823 @Override
824 public void onMessageFound(Message message) {
825 processSending(message);
826 }
827 });
828 }
829 }
830 });
831 } catch (InvalidJidException e) {
832 Log.e(Config.LOGTAG,"Got address with invalid jid: " + address.getName());
833 }
834 }
835
836 private boolean createSessionsIfNeeded(Conversation conversation) {
837 boolean newSessions = false;
838 Log.d(Config.LOGTAG, "Creating axolotl sessions if needed...");
839 Jid contactJid = conversation.getContact().getJid().toBareJid();
840 Set<AxolotlAddress> addresses = new HashSet<>();
841 if(deviceIds.get(contactJid) != null) {
842 for(Integer foreignId:this.deviceIds.get(contactJid)) {
843 Log.d(Config.LOGTAG, "Found device "+account.getJid().toBareJid()+":"+foreignId);
844 addresses.add(new AxolotlAddress(contactJid.toString(), foreignId));
845 }
846 } else {
847 Log.e(Config.LOGTAG, "Have no target devices in PEP!");
848 }
849 Log.d(Config.LOGTAG, "Checking own account "+account.getJid().toBareJid());
850 if(deviceIds.get(account.getJid().toBareJid()) != null) {
851 for(Integer ownId:this.deviceIds.get(account.getJid().toBareJid())) {
852 Log.d(Config.LOGTAG, "Found device "+account.getJid().toBareJid()+":"+ownId);
853 addresses.add(new AxolotlAddress(account.getJid().toBareJid().toString(), ownId));
854 }
855 }
856 for (AxolotlAddress address : addresses) {
857 Log.d(Config.LOGTAG, "Processing device: " + address.toString());
858 FetchStatus status = fetchStatusMap.get(address);
859 XmppAxolotlSession session = sessions.get(address);
860 if ( session == null && ( status == null || status == FetchStatus.ERROR) ) {
861 fetchStatusMap.put(address, FetchStatus.PENDING);
862 this.buildSessionFromPEP(conversation, address);
863 newSessions = true;
864 } else {
865 Log.d(Config.LOGTAG, "Already have session for " + address.toString());
866 }
867 }
868 return newSessions;
869 }
870
871 @Nullable
872 public XmppAxolotlMessage encrypt(Message message ){
873 final XmppAxolotlMessage axolotlMessage = new XmppAxolotlMessage(message.getContact().getJid().toBareJid(),
874 ownDeviceId, message.getBody());
875
876 if(findSessionsforContact(message.getContact()).isEmpty()) {
877 return null;
878 }
879 Log.d(Config.LOGTAG, "Building axolotl foreign headers...");
880 for (XmppAxolotlSession session : findSessionsforContact(message.getContact())) {
881 Log.d(Config.LOGTAG, session.remoteAddress.toString());
882 //if(!session.isTrusted()) {
883 // TODO: handle this properly
884 // continue;
885 // }
886 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
887 }
888 Log.d(Config.LOGTAG, "Building axolotl own headers...");
889 for (XmppAxolotlSession session : findOwnSessions()) {
890 Log.d(Config.LOGTAG, session.remoteAddress.toString());
891 // if(!session.isTrusted()) {
892 // TODO: handle this properly
893 // continue;
894 // }
895 axolotlMessage.addHeader(session.processSending(axolotlMessage.getInnerKey()));
896 }
897
898 return axolotlMessage;
899 }
900
901 private void processSending(final Message message) {
902 executor.execute(new Runnable() {
903 @Override
904 public void run() {
905 MessagePacket packet = mXmppConnectionService.getMessageGenerator()
906 .generateAxolotlChat(message);
907 if (packet == null) {
908 mXmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
909 //mXmppConnectionService.updateConversationUi();
910 } else {
911 Log.d(Config.LOGTAG, "Generated message, caching: " + message.getUuid());
912 messageCache.put(message.getUuid(), packet);
913 mXmppConnectionService.resendMessage(message);
914 }
915 }
916 });
917 }
918
919 public void prepareMessage(Message message) {
920 if (!messageCache.containsKey(message.getUuid())) {
921 boolean newSessions = createSessionsIfNeeded(message.getConversation());
922
923 if (!newSessions) {
924 this.processSending(message);
925 }
926 }
927 }
928
929 public MessagePacket fetchPacketFromCache(Message message) {
930 MessagePacket packet = messageCache.get(message.getUuid());
931 if (packet != null) {
932 Log.d(Config.LOGTAG, "Cache hit: " + message.getUuid());
933 messageCache.remove(message.getUuid());
934 } else {
935 Log.d(Config.LOGTAG, "Cache miss: " + message.getUuid());
936 }
937 return packet;
938 }
939
940 public XmppAxolotlMessage.XmppAxolotlPlaintextMessage processReceiving(XmppAxolotlMessage message) {
941 XmppAxolotlMessage.XmppAxolotlPlaintextMessage plaintextMessage = null;
942 AxolotlAddress senderAddress = new AxolotlAddress(message.getFrom().toString(),
943 message.getSenderDeviceId());
944
945 XmppAxolotlSession session = sessions.get(senderAddress);
946 if (session == null) {
947 Log.d(Config.LOGTAG, "Account: "+account.getJid()+" No axolotl session found while parsing received message " + message);
948 // TODO: handle this properly
949 session = new XmppAxolotlSession(axolotlStore, senderAddress);
950 sessions.put(senderAddress,session);
951 }
952
953 for (XmppAxolotlMessage.XmppAxolotlMessageHeader header : message.getHeaders()) {
954 if (header.getRecipientDeviceId() == ownDeviceId) {
955 Log.d(Config.LOGTAG, "Found axolotl header matching own device ID, processing...");
956 byte[] payloadKey = session.processReceiving(header);
957 if (payloadKey != null) {
958 Log.d(Config.LOGTAG, "Got payload key from axolotl header. Decrypting message...");
959 plaintextMessage = message.decrypt(session, payloadKey);
960 }
961 Integer preKeyId = session.getPreKeyId();
962 if (preKeyId != null) {
963 publishBundlesIfNeeded();
964 session.resetPreKeyId();
965 }
966 break;
967 }
968 }
969
970 return plaintextMessage;
971 }
972}